Improvement in drain-plows



MPETERS, FHOTD-LITHOGRAPHER. WASHINGTON D C L UNITED STATES PATENT OFFICE.

C. G. GRABO, OF GREENFIELD, MICHIGAN.

lIMPROVEMENT IN DRAIN-PLOWS.

Specification forming part of Letters Patent No. 38,677, dated May 26, 1863.

To all whom it may concern:

Be it known that I, G.'G. GRABO, of the township of Greenfield, in the county of Wayne and State of Michigan, have invented a new Drain-Plow; and I do hereby declare that the following is a full and exact description of said invention.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

l represents the beam of my drain-plow.

2 represents an iron regulator or standard, which passes through a slot near the front end of the plow-beam, and which is perforated by a number of holes, a, to adjust the position of said regulator to the beam by means of the iron pins or keys 3, for the purpose of causing the plow to run in the desired grade.

8 represents the colter, to which the mole b is secured. This colter is firmly secured atits upper ends to the plow-beam, and as it cuts through the ground it is desirable thatit should be so constructed as to oifer the greatest possible strength and und the least possible re sistance in the ground. These two objects I attain by making the colterS V-shaped, as represented in the drawings, the two upper ends being secured to the plow-beam, and the mole being secured to the lower end, where the two shanks meet,therebycnabling meto secure said colter eiiectually to the beam, and this shape oft'erin g great resistance against any pressure which is brought against it in front, while its two i'ront edges, c and d, presenting inclined lines, operate in a draw-cutin the ground,which it is well known can be made with less power and which works more et't'ectually than the cut ot' the knife, the edge of which is perpendicular to the line ot' motion. The angle which the two shanks of the V-shaped colter form with each other is such that when a perpendicular line is drawn from the apex f to the plow-beam the two shanks of the colter shalllzespectively be on the two sides of said perpendicular, thus causing the two edges to cut in two different directions-that is, the edge c cuts downward and the edge d upward-thus equalizing the strain which is brought on the colter to a great extent.

7 represents the rod to which the tugchain is hitched. Its rear end is secured at g to the front colter, 8, and thereby the strain of the draft is directly on the colter and not on the beam l, thus preventing the colters 8 from working loose in their fastenings in the beam. The front end of the rod 7 passes through an oblong hole in regulator 2, bearing with the shoulder It against it to keep it in its proper position, and the front end of the rod terminates in the hook m, to which the tug-chain is secured. Thus it will be seen that the entire strain by which the plow is operated acts directly on the colter S to which the mole is attached. The grade of the drain-plow is adjusted by means ofthe application of a graduated circle, 9, to the center of which a pointer, 4, is pivoted whose lower end is weighted so as to keep it in a perpendicular position; and the grade ot' the plow can be adjusted by means ot' the regulator 2 by observing the pointer 4 indicating the angle of elevation or inclination by reference to the points 0 l 2 3 marked on tt@ dial.

The plow-handles 4 are secured to the beam 1 by means of an iron clevis, 5, which is secured to the top ot' the plow-beam, and' they are supported by means ot' the braces 6, which are secured to the rear end of the plow.

In operating the plow the mole b and colter 8 are sunk in the eld to the required depth. The grade of the plow is then adjusted, and the plow is forced through the ground by any power attached to the front end, m, of the rod 7, and the mole b is forced through the earth, forming a solid walled `drain therein, while the colter S cuts through the ground to hold and guide the mole.

Having thus fully described the nature 0f my invention, what I claim herein as new, and desire to secure by Letters Patent, is-

l. The application to mole-plows of a V- shaped colter, when the two shanks of said colter form such an angle with each other as to stand respectively to bot-h sides of the perpendicular line drawn from the apex ofthe triangle tothe plow-beam,substantially in the manner land for the purposes herein described.

2. In combination with a V-shaped colter, as herein described, the draft-rod 7 and regulator 2, substantially in the manner and for the purposes herein set forth.

CHRISTIAN G. GRABO. 

